Isothermal Process

1. The problem statement, all variables and given/known data
Calculate Q(in) and Q(out).

2. Relevant equations
Specific Heat: Cv = 5/2 R
R = 8.314 J/mol K

3. The attempt at a solution
For the process C-> A, it is an isothermic process but we are not given temperature. The equation to finding the total work done from C->A is nRT ln (Va/Vc). How do I get T in order to solve for nRT ln (Va/Vc)?

Using the formula PV = nRT and solving for P, we get P = nrT/V, so W (C to A) = (Integral from C to A) nRT/V dv, which comes out to be nRT ln v (from C to A). Finally plugging in C and A, we get nRT ln (Va - Vc) = nRT ln (Va/Vc)